28 FUNCTIONS
28.3 Tracking Transfer
461
28
Tracking transfer setting for the signal flow memory
By transferring the signal flow memory, operations of rising/falling instructions in the old control system are taken over to the
new control system even after system switching.
"Signal Flow Memory Tracking Setting" is set to "Transfer" by default. Transferring the signal flow memory is
recommended. For the operation not to transfer it, refer to the following.
Page 506 Instructions whose operations vary depending on tracking of the signal flow memory
■Tracking of individual POUs
The following table shows whether the signal flow memory is transferred or not for each POU.
: Transferred, : Not transferred, : No signal flow memory
*1 To prevent the signal flow memory in the standby system from being overwritten in a both systems execution program, use a local FB.
When a global FB is used, the signal flow memory in the standby system is overwritten with the signal flow memory in the control
system.
Tracking device/label setting
The following two methods are available for transferring devices and labels: automatically transferring all the devices and
labels in a batch or transferring specified devices and labels of a specified tracking block.
■Batch transfer
When "Tracking Device/Label Setting" is set to "Transfer collectively", the following devices and labels are assigned to the
tracking block No. 1 and automatically transferred.
*1 The data used in both systems execution programs is not transferred.
*2 Global labels with devices assigned are not transferred as global labels. They are transferred according to the tracking setting of the
assigned devices. To transfer global labels with devices assigned, specify the assigned global devices in the global device setting. (
Page 463 Global device setting)
POU Both systems program executions setting
Control system
execution
Both systems
executions
Program block
Function block Macro type
Subroutine type Global FB
*1
Local FB
Function
Type Description
Global device ■Bit device
• Input (X)
•Output (Y)
• Internal relay (M)
• Link relay (B)
• Edge relay (V)
• Latch relay (L)
■Word device
•Timer (T)
• Long timer (LT)
• Retentive timer (ST)
• Long retentive timer (LST)
• Counter (C)
• Long counter (LC)
• Data register (D)
• Link register (W)
• Index register (Z)
• Long index register (LZ)
Local device
*1
All local devices
Global label
*2
All the global labels assigned to the device/label memory
Local label
*1
All local labels
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